It’s a saying I wasn’t aware of until a couple of days ago, but apparently it’s a saying nevertheless:

There are two kinds of people in the world: Those who love Neil Diamond and those who don’t know they love Neil Diamond.

In fact, I discovered, the original quote comes from the movie What About Bob, in which the title character attributes the failure of his would-be marriage to his ex-fiancee’s love for Neil Diamond. He resolves: “There are two types of people in the world: Those who like Neil Diamond and those who don’t.”